7. The mechanic at CarPoint is able to install new mufflers at an average of three per hour while customers needing this service arrive at an average rate of2 per hour. Assuming that the conditions for a single-server infinite population model are all satisfied, calculate the following:

(a) The utilisation parameter.

(b) The average number of customers in the system.

(

c) The average time a customer spends in the system.

(

d) The average time a customer spends in the queue.

(

e) The probability that there are more than three customers in the system.

(M Com, Delhi, 2008)